[3][4] After receiving his PhD in 1974, he completed a postdoctoral fellowship at University of Western Ontario where he worked with John Landstreet, gaining experience with observational astronomy.
[5] In 1982, the group made headlines by predicting the existence of a new type of pulsating star, a DB white dwarf, which was later confirmed by telescope observations.
[3] In 1996, the asteroseismology group at the Université de Montréal once again predicted a new type of variable star, a B-type white subdwarf, which was confirmed by observations by the South African Astronomical Observatory in 1997.
[3] In 1992, he became a fellow of the Royal Society of Canada and in 2016 he was awarded the Canadian Association of Physicists Medal for Lifetime Achievement in Physics "for his pioneering, world-renowned work in theoretical and observational studies of white dwarf stars.
He was a member of the Institute for Research on Exoplanets (iRex) and the Centre de recherche en astrophysique du Québec (CRAQ).